Audi
Secondary air injection flow is wrong. Cold-start emissions only; car drives normally.
P0411 fault code: what it means
P0411: Secondary air injection flow incorrect: the cold-start air pump system is not moving the right amount of air.
Usual causes, most likely first
- failed air pump (often water-damaged)
- stuck check / switching valve
- split hoses
- pump relay fault
P0411 by make
Skoda
Secondary air injection flow is wrong. Cold-start emissions only; car drives normally.
Volkswagen
Secondary air injection flow is wrong. Cold-start emissions only; car drives normally.
What the repair usually costs
- Glow plugs (diesel, set of 4)NZ$250–NZ$850 · A$250–A$850
Not sure what P0411 means on your car? Ask Credov.
Before you clear it
Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.
Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.